His single target ability is Hydro Lance, which is cast at a random raid member and hits for ~85k damage. This spell can and needs to be interrupted. Having a designated interrupter is optimal for this.

Next is Water Bomb, which is a fountain-like ability that spews out towards the raid. If hit by these bubble-like bombs, you will become Waterlogged, reducing movement speed by 25%. To dispel this, you must move your character through Ignacious’ flame trail. (Described below)

Alongside these two abilities, Feludius will also cast Glaciate, which is a small nova-like spell cast at his current location that will freeze anyone that is still waterlogged. This is the reason you will want your ranged on Feludius. Have the tank run out when he starts casting this, because it does more damage the closer you are.

Finally, the last ability Feludius will cast is Heart of Ice. This ability is like the Storm Cloud on Hodir. It buffs anyone that comes into contact with it, and you can spread it to nearby allies. You want to have heart of ice spread amongst anyone attacking Ignacious because it will increase damage done on him.

~Ignacious

Ignacious’s single target ability is Flame Torrent. It is a frontal cone attack that deals ~40k damage per second over 3 seconds. It is always cast on his target, so have your tank face him away from the raid.

In addition to this, Ignacious will cast Inferno Leap and jump towards a random ranged raid member. When he lands he will knock back anyone within a small radius and proceed to charge back to the tank, leaving a trial of fire in his wake. This is what you use to remove Waterlogged.

His next ability is Aegis of Flame. This ability places a shield on Ignacious, at which point he will start casting Rising Flames. Rising flames is a stacking, channeled ability that increases his fire damage done. You need to burn through the Aegis in order to interrupt this ability. Have every DPS (except your Hydro Lance interrupter) switch to break this shield.

His last ability is Burning Blood, a mirror of Hear of Ice. When you have this debuff cast on a member, have that person run through the DPS on Feludius.

When EITHER one of these guys hits 25% HP, they will teleport to the balcony above triggering Phase 2.

---Phase 2---~Arion

Arion’s first ability is called Lightning Blast, which is a giant lightning shock cast on a random raid member. This can and should be interrupted.

Along with that, he will also Disperse to a random location in the room. He will cast a Lightning Blast immediately after dispersing, so be ready to interrupt.

In addition to those two, he will place a Lightning Rod on a random raid member. After 5 seconds of having this on you, you will conduct chain lightning to EVERYONE 20yds around you. Run to the wall ASAP if you get this. This will wipe you.

Finally, Arion’s last ability is Call Winds. This creates a tornado in the room. There will be ~2 active at all times. By running into this you gain Swirling Winds. The benefit of this is to avoid Terrestra’s Quake ability, which deals ~60k damage if hit by this.

~Terrestra

Terrestra’s first ability is called Eruption, which is a group of spikes that emerge after a few seconds, from Terrestra’s current location. This deals damage and knocks players into the air. Just have your tank kite him out of this.

Along with that, he will also cast Hardened Skin on himself. This ability is a shield-like ability that will absorb 50% of all damage done up to 500,000. When the shield is broken, Terrestra will take an additional 10% off of his health.

Finally, Terrestra’s last ability is Gravity Well. This creates a small well of gravity that sucks you in and gives you the Grounded debuff. The benefit of this is to avoid Arion’s Thundershock ability. Deals ~80k damage to anyone not grounded.

When EITHER one of these guys hits 25% HP, they will halt the encounter, triggering Phase 3.

---Phase 3---~Elementium Monstrosity

This is 100% a burn phase. Involves some kiting and major healing.

When you enter this phase, you will want your ranged to be spread out as much as possible. This is due his ability Electric Instability, which chains to nearby targets.

He will also cast Lava Seed. This sprays seeds out into the room and will detonate after a short period of time.

Additionally, he will randomly Gravity Crush a member of your raid, lifting him into the air, causing major damage, and take fall damage upon landing.

Finally, his ability Cryogenic Aura will cause puddles of frost to appear on the ground. They will expand the longer he remains in them… Kite him around the room for this. This, along with his other abilities act as a soft enrage timer.

I wish you the best of luck, and feel free to critique my post/ask questions.

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Comment by bluudbath

90 hunter easily soloed 10n.

Comment by fosley

Solo'd 25H as a 630 demo lock. For the first phase, I put my void on both bosses and focused Ignacious. At 25% phase 2 starts and the next two bosses show up. I got the Heart of Ice DoT during phase 1, making phase 2 rather challenging. It might be worth it to just swap to the imp to Singe Magic, then back to the void (I'm not actually sure if you need the void). I saved all my defensives until phase 2, then burned Arion. By the time the Elementium Monstrosity was out, the DoT had worn off and I just burned him down.

Edit: This week, I tried to singe the DoT off me, but I couldn't get it to work. So I switched to affliction, sacced my imp, then discovered he doesn't cast the DoT. So it's probably best to put your void on passive, then only attack Ignacious (so you have aggro from Feludius). Then you won't have to worry about the DoT. Or just switch to aff/destro and sac your pet.

At the start of the encounter, Feludius and Ignacious enter the battle. Arion and Terrastra then watch from the balconies above.

In Heroic Difficulty Arion and Terrastra assist their fellow councillors.

Feludius

Ascendant Councillor of Water

Glaciate
– Feludius unleashes a burst of Frost that damages all players in the room. Damage taken decreases with distance from Feludius, and any victims at point-blank range suffer fatal damage. Players afflicted by Waterlogged when Feludius uses Glaciate become Frozen and suffer additional damage.

Water Bomb
– Feludius lobs a shower of watery missiles throughout the room, splashing down and inflicting 2730 to 2870 Frost damage to players within 0 yards of each impact. Water Bomb afflicts Waterlogged on any enemy damaged.

Waterlogged
– Water Bomb soaks the player in icy water, reducing their movement speed by 25%. Feludius's Glaciate will cause all Waterlogged players to become Frozen. Exposure to the intense heat from Ignacious's abilities removes this effect.

Frost Imbued
– A player with a Heart of Ice empowers other nearby players with Frost energy for 30 sec, causing their attacks to deal additional damage to Ignacious.

Ignacious

Ascendant Councillor of Flame

Aegis of Flame
– Ignacious surrounds himself with a radiant shield of flame, absorbing up to 500000 damage and preventing spell interruption while active. He begins channeling Rising Flames immediately after Aegis.

Rising Flames
– After shielding himself with Aegis of Flame, Ignacious begins to channel Rising Flames, inflicting 3780 to 4620 Fire damage to all players in the room every 2 sec. Each time Rising Flames pulses, Ignacious increases his damage dealt by 3% for 15 sec. This effect stacks at an increasing rate.

Inferno Rush
– Ignacious leaps to a distant target, knocking away all enemies within 10 yards of the point of impact and inflicting 3885 to 4515 Fire damage. Ignacious then rushes back to his last target, leaving a trail of fire in his wake. Standing within this fire inflicts 1295 to 1505 Fire damage every 0.5 sec.

Gravity Core
– Terrastra crushes a random player with intense gravitational force, inflicting 2600 Physical damage every 2 sec. While the Gravity Core crushes a player, the gravitational field pulses on nearby players within 0 yards. This field reduces a player's movement speed by 50% and haste by 100% for 10 sec.

Once either Feludius or Ignacious reaches 25% health, both Councillors retreat. Arion and Terrastra then descend from above to carry on the fight.

Arion

Ascendant Councillor of Air

Call Winds
– Arion focuses and agitates the nearby air into a violent cyclone. This cyclone wanders randomly around the room for 50 sec before dissipating. The cyclones knock upwards any player who touches them and inflict the Swirling Winds effect on that player.

Swirling Winds
– After contact with one of Arion's cyclones, a cloud of swirling air coalesces beneath the feet of a player and lifts them off the ground for 2 min. The Grounded effect cancels the Swirling Winds effect.

Thundershock
– Arion unleashes a massive electrical storm that fills the room with crackling lightning, inflicting 21840 to 22960 Nature damage to all players. Players with the Grounded effect take greatly reduced damage.

Lightning Rod
– Arion marks a random player as a target for a forthcoming Chain Lightning attack.

In 25 player raids Arion marks three random players as targets.

Chain Lightning
– Arion fires an arcing pulse of lightning at all players marked as Lightning Rods, inflicting 3724 to 4116 Nature damage and bouncing to additional nearby players within 15 yards. The damage inflicted by Chain Lightning increases as the pulse bounces to additional players.

Gravity Well
– Terrastra creates a pocket of intense gravity near a random player. The Gravity Well periodically inflicts 840 Nature damage to players within 0 yards and draws them into its pull for 30 sec. Players pulled into Gravity Wells gain the Grounded effect.

Grounded
– After contact with one of Terrastra's gravity wells, the player gains the Grounded effect. This lasts for 2 min., but Swirling Winds lift the player from the ground and removes this effect.

Harden Skin
– Terrastra's skin hardens into solid rock, increasing his Physical damage dealt by 20% and absorbing 50% of all damage taken, up to 500000 for 30 sec. If Terrastra reaches this threshold before the effect ends, Terrastra's rocky skin shatters, causing him to suffer all the damage that Harden Skin absorbed.

Quake
– Terrastra sends massive shockwaves through the earth, inflicting 17745 to 18655 Physical damage to all players. Players with the Swirliing Winds effect take no damage.

Eruption
– Terrastra causes rocky spikes to emerge from the ground around his feet. Each spike impales players within 0 yards of it, inflicting 6597 to 7403 Physical damage and knocking them up in the air.

Feludius

Frozen Orb
– Feludius summons a sphere of pure Frost energy to relentlessly pursue a random player. The sphere gains speed over time. If the Frozen Orb reaches its target, it explodes and inflicts 56000 Frost damage on all players.

Ignacious

Flame Strike
– Ignacious targets the location of a random player, then launches a massive fireball towards that location. The Flame Strike deals 54600 to 57400 Fire damage on impact and leaves a lingering patch of fire. This fire inflicts 5180 to 6020 Fire damage every 1 sec. to players within 7 yards.

Once either Arion or Terrastra reaches 25% health, the Councillors grow impatient and place all combatants in a stasis field. All four Councillors combine to form the Elementium Monstrosity, beginning the final phase of the encounter.

Elementium Monstrosity

The initial health of the Elementium Monstrosity equals the combined remaining health of each of the four Councillors.

Electric Instability
– Every 1 sec. the Monstrosity zaps nearby players with electrical bolts for 1319 to 1481 Nature damage. The electrical bolt chains to nearby players. The Elementium Monstrosity is an unstable creature and emanates increasing amounts of electrical energy over time. The increased energy causes the electrical bolts to strike an increasing number of targets.

Gravity Crush
– The Elementium Monstrosity traps a player in a gravity bubble, lifting them off the ground and crushing them for 6% of their maximum health every 0.5 sec for 6.50 sec. When the effect ends, the player falls to the ground.

In 25 player raids the Elementium Monstrosity traps three players in a gravity bubble.

Lava Seed
– The Elementium Monstrosity showers the surrounding area with kernels of pure Flame energy. Each Lava Seed erupts and inflicts 12250 to 15750 Fire damage to any player within 4 yards.

Cryogenic Aura
– The preternaturally cold Monstrosity reduces all damage taken by 25% and freezes the ground beneath it. The Monstrosity continually forms pools of Liquid Ice beneath its feet. These pools inflict 2660 to 2940 Frost damage every 1 sec to players that stand within them. Pools of Liquid Ice expand while they remain in contact with the Monstrosity.